The file from Instant Replay crashes when "separate microphone track" option is enabled.

It appears like this: http://prntscr.com/jlwx6h and cannot be played in any way. When I have it disabled, Instant Replay works perfectly. But I want to have my mic track separated from the gameplay track, so I can sync my mic with my recording, because sometimes my microphone audio isn't on sync with my gameplay.